Answer:
84.2 grams
Explanation:
you have to multiply 8.42x10^18 to get the answer above
The number of the atom can be used to estimate the mass and moles of the substance by Avogadro's number. The mass of 8.42 x 10¹⁸ atoms of Bromine is equivalent to 0.0011 grams.
What is the mole concept?The mole concept has been the unit of the amount of estimating the mass of the substances with smaller entities. It uses the SI unit mol to measure the amount of mass. It also has been defined by 6.02214076 × 10²³ (Nₐ, Avogadro's number) elementary entities.
The molar mass of Bromine (Br) is 79.904 u and atoms are 8.42 x 10¹⁸.
Atoms to mass are converted as:
= ( 8.42 x 10¹⁸ atom ÷ 1 ) × ( 1 mole Br ÷ 6.02214076×10²³ ) × (79.904 gm Br ÷ 1 mol Br)
= (8.42 x 10¹⁸ × 79.904 gm) ÷ 6.02214076 × 10²³
= 6.727 × 10²⁰ ÷ 6.02214076 × 10²³
= 1.117 × 10⁻³ grams
Therefore, 0.0011 grams is the mass of bromine.
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The least massive of all the alkaline earth metals. Who
am I?
Chased on atomic mass, the least massive of the alkaline earth metals is Beryllium.
What are alkaline earth metals?Alkaline earth metals are the metals found in group 2 of the periodic table of elements.
The alkaline earth metals include:
Beryllium Magnesium CalciumThe least massive is the first element in the group.
Therefore, the least massive of the alkaline earth metals is Beryllium.
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Convert the following: 4.6L(liters) to ml(milliliters).
a. 0.46 ml
b. 46 ml
c. 46,000 ml
d. 4600 ml
Answer:
D
Explanation:
Answer:
D
Explanation:
1000 mL = 1 L
so
1000 × 4.6 = 4600
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Answer:
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Explanation:
stays the same the mass and stuff dosnt change.
The melting point of chromium is 1890. The melting point of argon is -189. Suggest a reason for this difference.
Answer:
Different forces between atoms and difference in structure.
Please can i have help on these two multiple choice questions.I’ll be so grateful!!!
Answer:
1(neutrons) 2(protons)
Explanation:
When paper is burned, the mass of the remaining ash is less than the mass of the original paper.
Which statement best explains this result?
0 The ash has less volume than the paper.
O Some of the matter is destroyed during the reaction.
O The mass of the ash cannot be accurately determined.
O Some of the products of the reaction were given off as a gas.
When paper is burned, the mass of the remaining ash is less than the mass of the original paper because Some of the products of the reaction were given off as a gas.
The postulate of the law of conservation of mass is that mass can not be created or destroyed rather it can be transformed from one form to another.
This means that when ash is left behind after burning paper, the total mass should be the same as was obtained before combustion but it rather weighs less than paper itself. This should never be interpreted to mean that mass was "lost".
Here is what happens, paper is an organic material and burning it in air yields CO2 gas which escapes into the atmosphere. This explains why; when paper is burned, the mass of the remaining ash is less than the mass of the original paper.
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2. Predict which food sample you think has the most stored energy
Explain.
Type your answer here.
TT
B 1
IC
Answer:
carbohydrate yam rice
Based on the chemical equation provided, use the drop-down menu to choose the coefficients that will balance the
chemical equation.
102
DH20
1)H₂ +
-
Answer:
2(H2) + 1(O2) = 2 (H2O) is the balanced equation
Answer:
(2)H2O
(2)H2
(1)O2
Explanation:
it's not 2 1 2
or
2 1 1
which character of Life distinguishes a fire and a flowering plant
Answer:
a flowering plant needs water while a fire doesn't.
That what I guessed???
I don’t know how to do thos
Answer:
75,000,000,000,000,000,000
Explanation:
7.5e+19 (7.5*10^19)
Two scientists write a paper detailing their research and conclusions and submit it to a scientific journal. Several
months later, the publisher sends them back the paper. Many comments from several fellow scientists are attached.
Which step will the authors of the paper most likely take next?
They will change their research to a different topic and start all over again
O They will alter the data to match the results that their peers were expecting.
O They will incorporate the suggestions from their peers and resubmit the paper.
They will sue the journal for delaying their research and not printing the paper
Answer:
C
Explanation:
I just took the test
Answer: They will incorporate the suggestions from their peers and resubmit the paper.
Explanation:E 2022
Which element is a liquid at 1000.K
Answer:
silver?
Explanation:
Answer the following question.
Answer:
B) The north and south Poles
Explanation:
when dealing with magnets they have a negative and Positive charge on their south and north poles. Negative attacks with positive and positive with negative so both poles on each magnet should react to each other
Which one of the following is an alkane?
A. C2H4
B. C5H10
C. C3H8
D. C4H6
Hello
Answer:
C. C3H8
A student sets up an experiment to test the factors that affect the
solubility of sodium chloride. The student places 5.Og of sodium chloride in
four beakers containing 250 mL of water. The student places each beaker
on a different hot plate and heats them to the following temperatures:
Beaker A: 30°C, Beaker B: 40°C, Beaker C: 50°C, Beaker D: 60°C. In which
beaker would the sodium chloride dissolve at the fastest rate? *
Beaker A
Beaker B
Beaker C
Beaker D
Answer:
Beaker D
Explanation:
Since Sodium Chloride melting point is 1,474°F (801°C) the logical possible answer would be D: 60C.
Is water an element?
a:yes
b:We can't tell from a periodic table
c:No
Answer:
no it is not. The name refers to the chemical formula of water H20 so water is made from elements, but is not itself an element
what do small numbers of 12,22, and 11 stands for in C12H22O11
Answer:
The number of each element in the molecule.
Explanation:
C₁₂H₂₂O₁₁ is one molecule, and it is made 3 elements carbon, hydrogen, and oxygen. There are 12 carbons, 22 hydrogens, and 11 oxygens. If these numbers were different, it would be a different molecule.
Patrick did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 60 g of Substance A in the beaker labeled A and 60 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Experimental Observations
Substance Mass of Undissolved Substance at Different Temperatures (gram)
20 ° 40 ° 60 ° 80 °
A 18 14 10 5
B 60 60 60 60
Part 1: Which, if any, substance is soluble in water?
Part 2: Explain how the data helped you determine solubility for both substances for temperatures 20 °C to 80 °C.
Answer:
1. SUBSTANCE A IS SOLUBLE IN WATER WHILE SUBSTANCE B IS INSOLUBLE IN WATER.
Looking at the information given in the question about the two substance, you will discover that 60 g of both substances were initially put in the beaker. While the mass of undissolved substance for substance A is variable, that of substance B remain constant at 60 g, this shows that the substance is not soluble in water.
2. Looking at the two substances given in the question, you will observe that for substance A, the degree of solubility in water decreases as the temperature of the water increases. For instance, at 20 degree Celsius, the mass of undissolved substance is 5 and as the temperature increases to 40, 60 and 80 degree Celsius, the mass of undissolved substances also increase to 10, 14 and 18 respectively. This shows that, the higher the temperature, the less of the substance will dissolve. For substance B, the mass of undissolved substance remain constant at all temperatures, which shows that the substance is insoluble in water. Thus, the data given helps to determine the solubility of the substance by giving the amount of substances that are insoluble at each temperature.
Explanation:
How cab yout knowledge about solutions help improve health or the quality of life? In what practical way can you use your knowledge about it?
Answer:
Here are possible ways to improve health and quality of life:
-Exercise almost everyday
-Be more positive
-Get rid of bad habits
-Start good habits
-Get new things
-Learn New things
How have batteries gotten better over time
Answer:
Yes they have gotten better overtime
Explanation:
The explanation that includes scientific principles (key concepts) is the...
A. Claim
B. Evidence
C. Reasoning
Answer:
B. Evidence
Explanation:
What happens when the number of particles in an atom is changed
Answer:
When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!
Explanation:
Which of the following statements incorrectly describes the assumptions of the kinetic molecular theory? Group of answer choices The particles that make up a substance have differing amounts of kinetic energy. Matter is composed of very small particles. Based on the state of matter a substance is in, it has varying particle arrangement. Particles stop moving completely when they are very cold.
Answer: B- Matter is composed of very small particles.
Explanation:
a. The particles that make up a substance having different amounts of kinetic energy.
b. Matter is composed of very small particles.
c. Based on the state of matter a substance is in, it has varying particle arrangement.
d. Particles stop moving completely when they are very cold.
The assumptions of KMT:
- Molecules are in constant random motion.
- They undergo elastic collisions; other than collisions.
- Particles do not interact with each other.
- The distance between particles is large compared to their size.
A, C, and D all have something similar to the assumptions that I have listed. B is something completely random and unrelated. (As far as KMT goes.)
Gold atoms can be identified based on the number of which subatomic particles?
A.neutrons
B.electrons
C.nuclei
D.protons
Answer:
D.protons
Explanation:
Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.
Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.
Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.
electronegativity of argon element
Answer:
argon is 18 2-8-8 since it has octet circle and fully stable you can say it has no electro negativity
is this correct please help?
Answer:
[tex]\boxed {\tt Number \ and \ unit}[/tex]
Explanation:
The two requirements for a measurement are a number and a unit.
For example, here is a measurement:
38.6 cm
The number is 38.6 and the unit is cm, or centimeters.
Therefore, both number and unit are correct.
The Earth is always _______ as it revolves around the sun.
Fill in the blank
Get Brainliest if correct.
Answer
Rotating
Explanation:
The Earth is always being pulled towards the Sun by gravity.
The Earth is not moving fast enough to "escape" the Sun's gravity and leave the solar system, but it is going too fast to be pulled into the Sun. Therefore, it keeps going around and around( roating)- orbiting the Sun.
Answer:
Rotating around the sun
Use the periodic table to select the element that best fits each of the following descriptions. Halogen:
fluorine
scandium
hydrogen
answer is fluorine
Answer: fluorine
Explanation:
Answer:
fluorine on edge 2020
Explanation:
hope this helped:)
1)The thermostat on your hot water heater is raised 2 degrees celcius. If your hot water heater holds 400,000g of water, how much heat energy is used up to heat the tank?
2) The temperature of 50g of water was raised to 60c by the addition of 1.5 kJ of heat energy. What was the initial temperature of the water?
3) How much heat is released when 23.00g of water vapor condenses in a cloud to form raindrops?
4) How many joules of heat energy did the sun provide, of a 150 g patch of ice is melted
Explanation:
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the basic unit of matter is know as a(n)
a. atom
b.cell
c. element
d. compound
Answer:
a. atom
Explanation: